In order to study the weakening mechanism of new composite anchorage structures and their characteristics under static load, static Triaxial shear test were carried out. Research shows that: ① compared with non weakened specimens, the average deformation of weakened specimens is 2.7 times that of the latter, with a maximum of 7.3 times, and the average bearing capacity is 1.8 times that of the latter, with a maximum of 3.2 times; ② When the anchor rod in the non weakened specimen has reached a very high strain state or the specimen has undergone ultimate failure conditions, the anchor rod in the weakened specimen is still in a very low strain state; ③ The "canyon" phenomenon in the load-strain relationship curve of the weakened specimen is the result of overloading and failure of the pore wall medium between the weakened pores due to stress concentration, causing relative unloading of the specimen. The occurrence of multiple "canyon" phenomena essentially reflects the entire process effect of the pore wall medium from fracture, fragmentation to compaction; ④ The weakening effect of composite anchoring structures is very significant, with great potential. Fully utilizing this potential will have enormous social, economic, and military benefits